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Merger with Capella Education Company (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Oct. 29, 2017	Jun. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares	Aug. 01, 2018	Jan. 19, 2018 shares	Dec. 31, 2017 shares
Common stock, shares authorized		20,000,000	20,000,000			20,000,000
Merger costs | $		$ 2,824	$ 8,171
Merger Agreement
Conversion ratio	0.875
Common stock, shares authorized					32,000,000
Forecast | Merger Agreement
Voting equity interests (as a percentage)				52.00%
Capella | Forecast | Merger Agreement
Voting equity interests (as a percentage)				48.00%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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